package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import jakarta.annotation.Resource;
import jakarta.annotation.Resources;
import jakarta.servlet.http.HttpSession;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Service;


import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Autowired
    private StringRedisTemplate redisTemplate;
    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1、校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2、如果不符合，返回错误信息
            return Result.fail("手机号格式错误");
        }
        //3、符合，生成验证
        String code = RandomUtil.randomNumbers(6);

        //4、保存验证码到session
        //session.setAttribute("code", code);
        //4、保存验证码到redis
        redisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code,2, TimeUnit.MINUTES);

        //5、发送验证码
        log.debug("发送短信验证码成功，验证码：{}", code);

        //6、返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1、校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            //2、如果不符合，返回错误信息
            return Result.fail("手机号格式错误");
        }

        // 3、从redis中获取验证码并验证
       /* //3、从session中获取验证码并验证
        Object cacheCode = session.getAttribute("code");
        String code = loginForm.getCode();*/
        String cacheCode = redisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if (cacheCode == null || !cacheCode.equals(code)) {
            //3、不一致，报错
            return Result.fail("验证码错误");
        }

        //4、一致，根据手机号查询用户
        User user = query().eq("phone", phone).one();

        //5、判断用户是否存在
        if (user == null) {
            //6、不存在，创建新用户并保存
            user = createUserWithPhone(phone);
        }

        //7、保存用户信息到session中
       // session.setAttribute("user", BeanUtil.copyProperties(user, UserDTO.class));
        //7、保存用户信息到redis中
        //7.1随机生成token，作为登录令牌
        String token = UUID.randomUUID().toString(true);

        //7.2将User对象转为hashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> usertMap = BeanUtil.beanToMap(userDTO);
        //把long类型转换为String
        usertMap.put("id", userDTO.getId().toString());


        //7.3存储
        String tokenKey = LOGIN_USER_KEY + token;
        redisTemplate.opsForHash().putAll(tokenKey, usertMap);
        //7.4设置token有效期
        redisTemplate.expire(tokenKey, LOGIN_USER_TTL, TimeUnit.MINUTES);
        //8、返回token
        return Result.ok(token);
    }

    @Override
    public Result sign() {
        //1、获取当前登录的用户
        Long userId = UserHolder.getUser().getId();
        //2、获取日期
        LocalDateTime now = LocalDateTime.now();
        //3、拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //4、获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5、写入redis SETBIT key offset 1
        redisTemplate.opsForValue().setBit(key, dayOfMonth - 1, true);
        return Result.ok();
    }

    @Override
    public Result signCount() {
        //1、获取当前登录的用户
        Long userId = UserHolder.getUser().getId();
        //2、获取日期
        LocalDateTime now = LocalDateTime.now();
        //3、拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //4、获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5、获取本月截止今天为止的所有签到数据，返回的是一个十进制数字
        List<Long> result = stringRedisTemplate.opsForValue().bitField(key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0)
        );
        if (result == null || result.isEmpty()) {
            //没有任何签到结果
            return Result.ok(0);
        }
        Long num = result.get(0);
        if (num == null || num == 0) {
            return Result.ok(0);
        }
        //6、循环遍历
        int count = 0;
        while (true) {
            //7.1、让这个数字与1做与运算，得到数字的最后一个bit位 //7.2、判断这个bit位是否为0
            if ((num & 1) == 0) {
                //7.3、如果是0，说明这个日期未签到，可以签到
                break;
            }else{
                //7.4、如果不为0，说明已经签到，计数器加一
                count++;
            }
            //7.5、把数字右移一位，抛弃掉最后一个bit位
            num >>>= 1;
        }
        return Result.ok(count);
    }

    private User createUserWithPhone(String phone) {
        //1、创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(10));

        //2、保存用户
        save(user);
        return user;
    }
}
